Answer
x = 2
y = 1
Work Step by Step
x + y = 3
x = 2y
substitude x = 2y to the first equation
2y + y = 3 simplify
3y = 3
$\frac{3y}{3}$ = $\frac{3}{3}$ divide both sides by 3
y = 1
substitude y = 1 to the
x = 2y
x = $2\times1$
x = 2